Zobrazeno 1 - 10
of 53
pro vyhledávání: '"Roy J. Greenfield"'
Autor:
David G. Harkrider, Roy J. Greenfield
Publikováno v:
Geophysical Journal of the Royal Astronomical Society. 26:323-339
An exact expression is obtained for the acoustic-gravity layer matrix for an atmospheric layer having a linear temperature variation. Expressions are also derived for the layer derivative matrices needed to calculate group velocity and mode excitatio
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::234e768c01992b6616b89d933fd723ef
https://doi.org/10.1111/j.1365-246x.1971.tb03405.x
https://doi.org/10.1111/j.1365-246x.1971.tb03405.x
Publikováno v:
Applied Acoustics. 68:1241-1262
The direction-of-arrival (DOA) tracking performance of microphone arrays having aperture sizes ranging from 0.3 to 34 m is examined for an experiment involving a vehicle traversing a moderately complex terrain. A segment of the vehicle’s path was o
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::096fac3f18cd1d9ac877d9b3adcd3755
https://doi.org/10.1016/j.apacoust.2006.08.008
https://doi.org/10.1016/j.apacoust.2006.08.008
Publikováno v:
GEOPHYSICS. 71:T147-T150
We introduce a procedure for including the attenuation factor [Formula: see text] in a consistent manner in seismic modeling and show 3D examples. The [Formula: see text] fitting over a chosen frequency band involves two algorithms: The first creates
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::4f63f1721de806a548ee37cf001327fa
https://doi.org/10.1190/1.2329864
https://doi.org/10.1190/1.2329864
Publikováno v:
IEEE Transactions on Geoscience and Remote Sensing. 43:248-256
We develop a method for the loading of ground by moving vehicles in large finite-difference time-domain simulations of seismic wave propagation. The objective is to realistically produce two distinct types of ground loading for either wheeled or trac
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::9432eccbb965ee221b54bf59f58060c6
https://doi.org/10.1109/tgrs.2004.842212
https://doi.org/10.1109/tgrs.2004.842212
Publikováno v:
GEOPHYSICS. 68:559-565
We demonstrate that ground penetrating radar (GPR) reflection data from a temperate glacier are accurately modeled using a Helmholtz‐Kirchhoff diffraction integration technique that incorporates the radiation characteristics of point dipoles on a h
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::629f4653549abcdce2b3fa55ecda51bb
https://doi.org/10.1190/1.1567225
https://doi.org/10.1190/1.1567225
Publikováno v:
Journal of Applied Geophysics. 43:281-295
We compare the ability of several practical ground-penetrating radar (GPR) array processing methods to improve signal-to-noise ratio (SNR), increase depth of signal penetration, and suppress out-of-plane arrivals for data with SNR of roughly 1. The m
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::9478eb315badf184b95f8aa81bb4f561
https://doi.org/10.1016/s0926-9851(99)00065-8
https://doi.org/10.1016/s0926-9851(99)00065-8
Publikováno v:
Journal of Glaciology. 46:274-286
We have defined the complex bed topography for a section of a small temperate glacier using 50 MHz monostatic short-pulse radar data and a synthetic-aperture array-processing method. The data were collected on a 100 m by 340 m array grid in the upper
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::42952d962eeb1105a5b8cb27cd60a650
https://doi.org/10.3189/172756500781832882
https://doi.org/10.3189/172756500781832882
Publikováno v:
Journal of Geophysical Research: Solid Earth. 101:17523-17533
Measurements of linear strain, ultrasonic velocity, and attenuation (Q−1) were made simultaneously as functions of confining pressure on core and outcrop samples from the Moodus, Connecticut, area. Strain measurements indicate the core samples cont
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::b80bc81c9e5c01d9973aa3d242448038
https://doi.org/10.1029/96jb00107
https://doi.org/10.1029/96jb00107
Autor:
Earl K. Graham, Roy J. Greenfield
Publikováno v:
Journal of Geophysical Research: Solid Earth. 101:5643-5652
The occurrence of microcracks and pore space reduces the P and S wave velocities in rocks from those expected for the intrinsic mineral matrix. In the low-pressure regime, before microcracks close, the elastic properties and wave velocities are chara
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::d384a0a4cc2af2e5edffed91c080cc16
https://doi.org/10.1029/95jb03462
https://doi.org/10.1029/95jb03462
Publikováno v:
Tectonophysics. 247:49-64
Bedding-perpendicular joints confined to individual beds in interbedded sedimentary rocks commonly exhibit spacings which are proportional to the thickness of the jointed bed, and which vary according to lithology or structural position. The mechanic
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::e7baf658ec3e18afeb7e2e139723af22
https://doi.org/10.1016/0040-1951(94)00200-s
https://doi.org/10.1016/0040-1951(94)00200-s